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Technological method for municipal wastewater nitrogen and phosphorus removal

A municipal sewage, nitrogen and phosphorus removal technology, applied in water/sewage treatment, chemical instruments and methods, biological water/sewage treatment, etc., can solve the problem that water quality is difficult to meet discharge standards, water quality is difficult to remove phosphorus, and there is not much land for use and other problems, to achieve excellent mass transfer characteristics, good biological treatment effect, and rough surface of the carrier

Inactive Publication Date: 2010-06-23
四川冶金环能工程有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as the national discharge standard is raised to the first-class A standard, not only the water quality treated with the above conventional processes is difficult to meet the standard for phosphorus removal, but even the water treated with the MBR method is also difficult to meet the discharge standard.
In addition, due to the expansion of the city, the planned land use of the existing municipal sewage treatment plants has been restricted. As a result, the urban sewage plants surrounded by the city do not have much land available for standard upgrading and capacity expansion. Therefore, There is also an urgent need to develop a process method that occupies a very small area to meet its needs

Method used

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  • Technological method for municipal wastewater nitrogen and phosphorus removal

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Embodiment 1

[0022] As shown in the drawings, in this embodiment, the municipal sewage is placed in the bioreactor 2 loaded with microbial magnetic seeds 3 through the water inlet pipe 1 and the pH is adjusted to 9, and the dissolved oxygen in the aeration pipe 4 is 0.8mg / l, and then at a temperature of 20°C, the biological reaction was treated for 36 hours. The loaded microorganism magnetic seed 3 of the present embodiment was loaded with ferric oxide magnetic active carbon of microorganisms, and the concentration was 8500mg / l; after biological reaction treatment The mixed liquid enters the magnetic separator 6 with a magnetic field strength of 1800Gs on the surface of the disk through the self-flowing liquid discharge pipeline 5 at a flow rate of 0.4m / s for separation, and the separated liquid enters the scraper type rare earth disk separation device 10 to continue separation. The magnetically activated sludge formed in the end is returned to the bioreactor 2 through the magnetically act...

Embodiment 2

[0024] As shown in the accompanying drawings, in this embodiment, the municipal sewage is first placed in the bioreactor 2 loaded with microbial magnetic seeds 3 through the water inlet pipe 1, and the pH is adjusted to 7, and the dissolved oxygen in the aeration pipe 4 is 1.8mg / l, then biological reaction treatment at a temperature of 30° C. for 24 hours, the microorganism-loaded magnetic seed 3 put in the present embodiment is a magnetic microorganism carrier, and the preparation of the magnetic microorganism carrier is shown in the preparation method of the magnetic microorganism carrier disclosed in Patent Application No. 200910167879.8, The concentration is 8000mg / l; the mixed liquid after biological reaction treatment enters the magnetic separator 6 with a magnetic field strength of 1500Gs on the surface of the disk through the self-flowing liquid drainage pipe 5 at a flow rate of 0.3m / s for separation, and the separated liquid enters the scraper type Separation continue...

Embodiment 3

[0026]As shown in the drawings, in this embodiment, the municipal sewage is first placed in the bioreactor 2 loaded with microbial magnetic seeds 3 through the water inlet pipe 1, and the pH is adjusted to 6, and the dissolved oxygen in the aeration pipe 4 is 0.5mg / l, then biological reaction treatment at a temperature of 15°C for 46 hours, the loaded microorganism magnetic species 3 in the present embodiment is magnetic foaming polyvinyl alcohol and magnetic polyurethane foaming spheres, and the concentration is 9000mg / l; after biological reaction treatment The mixed liquid enters the magnetic separator 6 with a magnetic field strength of 2000Gs on the surface of the disk through the self-flowing liquid discharge pipeline 5 at a flow rate of 0.5m / s for separation, and the separated liquid enters the scraper type rare earth disk separation device 10 to continue separation. The magnetically activated sludge formed in the end is returned to the bioreactor 2 through the magnetica...

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Abstract

The invention discloses a technological method for municipal wastewater nitrogen and phosphorus removal. In the method, municipal wastewater is put into a bioreactor placed by a load microorganism magnetism seed and / or a magnetic zoogloea so as to carry out biological reaction treatment, obtained mixture liquid is sent into a magnetic separator so as to carry out first separation, coagulant is put into liquid after being separated so as to carry out reaction and enters rare earth magnetic disc separation equipment so as to carry out secondary separation, magnetic and active mud formed after separation refluxes into the bioreactor, and outlet water is drained as standard drainage water. Because a technology of combining biological reaction with drug adding magnetic separation is adopted, the invention has the advantages of low investment and running cost compared with a membrane bioreactor, high separation efficiency, low energy consumption, favorable effects of nitrogen and phosphorus removal, SS, COD and BOD and small occupied area and is particularly suitable for treating the municipal wastewater with large flow and high concentration and revamping the traditional municipal wastewater processing plant with capacity expansion.

Description

technical field [0001] The invention belongs to the technical field of municipal sewage treatment technology, and particularly relates to a process method for denitrification and phosphorus removal of municipal sewage, which uses biochemical technology to decompose organic matter and uses magnetic separation to separate solid and liquid. Background technique [0002] With the continuous development of cities and the increase of urban population, the discharge of urban organic sewage is also increasing. The treatment of municipal sewage generally adopts activated sludge method, biological contact oxidation method and their general derivative processes. With the decline of membrane cost and the advancement of membrane technology, the membrane bioreactor (MBR) method is also a popular technology for municipal sewage treatment. At present, the municipal sewage treatment plants built in China mainly adopt anaerobic-facultative-aerobic treatment process and oxidation ditch process...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F1/66C02F3/34C02F1/52C02F1/58
Inventor 倪明亮周勉
Owner 四川冶金环能工程有限责任公司
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